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# Jean Morlet Chair  | enregistrements trouvés : 158

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## Post-edited  Bayesian econometrics in the Big Data Era Frühwirth-Schnatter, Sylvia (Auteur de la Conférence) | CIRM (Editeur )

Data mining methods based on finite mixture models are quite common in many areas of applied science, such as marketing, to segment data and to identify subgroups with specific features. Recent work shows that these methods are also useful in micro econometrics to analyze the behavior of workers in labor markets. Since these data are typically available as time series with discrete states, clustering kernels based on Markov chains with group-specific transition matrices are applied to capture both persistence in the individual time series as well as cross-sectional unobserved heterogeneity. Markov chains clustering has been applied to data from the Austrian labor market, (a) to understanding the effect of labor market entry conditions on long-run career developments for male workers (Frühwirth-Schnatter et al., 2012), (b) to study mothers’ long-run career patterns after first birth (Frühwirth-Schnatter et al., 2016), and (c) to study the effects of a plant closure on future career developments for male worker (Frühwirth-Schnatter et al., 2018). To capture non- stationary effects for the later study, time-inhomogeneous Markov chains based on time-varying group specific transition matrices are introduced as clustering kernels. For all applications, a mixture-of-experts formulation helps to understand which workers are likely to belong to a particular group. Finally, it will be shown that Markov chain clustering is also useful in a business application in marketing and helps to identify loyal consumers within a customer relationship management (CRM) program.
Data mining methods based on finite mixture models are quite common in many areas of applied science, such as marketing, to segment data and to identify subgroups with specific features. Recent work shows that these methods are also useful in micro econometrics to analyze the behavior of workers in labor markets. Since these data are typically available as time series with discrete states, clustering kernels based on Markov chains with ...

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## Post-edited  Bayesian modelling Mengersen, Kerrie (Auteur de la Conférence) | CIRM (Editeur )

This tutorial will be a beginner’s introduction to Bayesian statistical modelling and analysis. Simple models and computational tools will be described, followed by a discussion about implementing these approaches in practice. A range of case studies will be presented and possible solutions proposed, followed by an open discussion about other ways that these problems could be tackled.

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## Post-edited  Interview at CIRM: Genevieve Walsh Walsh, Genevieve (Personne interviewée) | CIRM (Editeur )

'I am a geometric topologist, and I'm interested in problems in both geometric topology and geometric group theory. I study groups acting on spaces in a variety of contexts: groups acting on hyperbolic space with quotient the complement of a knot in S3, groups acting on trees, how to make a "good" space for a group to act on, and the many ways a particular group can act on a particular space. I also like to understand the geometry of these spaces.

I was trained (if a mathematician can be trained) as a 3-manifold topologist. Work that came out of my thesis showed that hyperbolic 2-bridge knot complements are virtually fibered. The relevant point is that every 2-bridge knot complement has a finite cover which is very nice geometrically: it is the complement of a link of great circles in S3. I've studied when a 3-manifold has a cover which contains an embedded incompressible surface, by using eigenspaces of covering group action. That every closed hyperbolic 3-manifold has such a cover is known as the virtually Haken conjecture. My current research on knot complements studies the question of commensurability: When do two manifolds or orbifolds have a common finite-sheeted cover? Commensurability is an equivalence relation on manifolds and orbifolds which is very rich even when restricted to knot complements. It tells us a lot about the geometry of the knot complement. For example, the shape of the cusp of a knot complement restricts its commensurability class.

Recently, I've been working on some questions about groups generated by involutions and the type of spaces they can act on. When does a right-angled Coxeter group act by reflections in hyperbolic space? When does the automorphism group of a reflection group act on a CAT(0) space? My approach to these group theoretical questions is deeply influenced by 3-dimensional hyperbolic manifolds and orbifolds. In turn, geometric group theory informs my research on manifolds and orbifolds.'

CIRM - Chaire Jean-Morlet 2018 - Aix-Marseille Université
'I am a geometric topologist, and I'm interested in problems in both geometric topology and geometric group theory. I study groups acting on spaces in a variety of contexts: groups acting on hyperbolic space with quotient the complement of a knot in S3, groups acting on trees, how to make a "good" space for a group to act on, and the many ways a particular group can act on a particular space. I also like to understand the geometry of these ...

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## Post-edited  Structure of hyperbolic manifolds - Lecture 1 Purcell, Jessica (Auteur de la Conférence) | CIRM (Editeur )

In these lectures, we will review what it means for a 3-manifold to have a hyperbolic structure, and give tools to show that a manifold is hyperbolic. We will also discuss how to decompose examples of 3-manifolds, such as knot complements, into simpler pieces. We give conditions that allow us to use these simpler pieces to determine information about the hyperbolic geometry of the original manifold. Most of the tools we present were developed in the 1970s, 80s, and 90s, but continue to have modern applications.
In these lectures, we will review what it means for a 3-manifold to have a hyperbolic structure, and give tools to show that a manifold is hyperbolic. We will also discuss how to decompose examples of 3-manifolds, such as knot complements, into simpler pieces. We give conditions that allow us to use these simpler pieces to determine information about the hyperbolic geometry of the original manifold. Most of the tools we present were developed in ...

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## Post-edited  The visual boundary of hyperbolic free-by-cyclic groups Stark, Emily (Auteur de la Conférence) | CIRM (Editeur )

Given an automorphism of the free group, we consider the mapping torus defined with respect to the automorphism. If the automorphism is atoroidal, then the resulting free-by-cyclic group is hyperbolic by work of Brinkmann. In addition, if the automorphism is fully irreducible, then work of Kapovich-Kleiner proves the boundary of the group is homeomorphic to the Menger curve. However, their proof is very general and gives no tools to further study the boundary and large-scale geometry of these groups. In this talk, I will explain how to construct explicit embeddings of non-planar graphs into the boundary of these groups whenever the group is hyperbolic. Along the way, I will illustrate how our methods distinguish free-by-cyclic groups which are the fundamental group of a 3-manifold. This is joint work with Yael Algom-Kfir and Arnaud Hilion.
Given an automorphism of the free group, we consider the mapping torus defined with respect to the automorphism. If the automorphism is atoroidal, then the resulting free-by-cyclic group is hyperbolic by work of Brinkmann. In addition, if the automorphism is fully irreducible, then work of Kapovich-Kleiner proves the boundary of the group is homeomorphic to the Menger curve. However, their proof is very general and gives no tools to further ...

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## Post-edited  Interview at Cirm: Shigeki Akiyama Akiyama, Shigeki (Personne interviewée) | CIRM (Editeur )

Shigeki Akiyama is Professor at the Institute of Mathematics of the University of Tsukuba, Japan. A regular organizer of the annual workshop on quasi-periodic tilings at RIMS, he has also spent time as organizer or invited professor on several occasions in France (Paris, Marseille, Strasbourg) but also in Debrecen and at the Chinese University of Hong-Kong.
CIRM - Chaire Jean-Morlet 2017 - Aix-Marseille Université

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## Post-edited  Bounded remainder sets for rotations on $p$-adic solenoids Haynes, Alan (Auteur de la Conférence) | CIRM (Editeur )

Bounded remainder sets for a dynamical system are sets for which the Birkhoff averages of return times differ from the expected values by at most a constant amount. These sets are rare and important objects which have been studied for over 100 years. In the last few years there have been a number of results which culminated in explicit constructions of bounded remainder sets for toral rotations in any dimension, of all possible allowable volumes. In this talk we are going to explain these results, and then explain how to generalize them to give explicit constructions of bounded remainder sets for rotations in $p$-adic solenoids. Our method of proof will make use of a natural dynamical encoding of patterns in non-Archimedean cut and project sets.
Bounded remainder sets for a dynamical system are sets for which the Birkhoff averages of return times differ from the expected values by at most a constant amount. These sets are rare and important objects which have been studied for over 100 years. In the last few years there have been a number of results which culminated in explicit constructions of bounded remainder sets for toral rotations in any dimension, of all possible allowable ...

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## Post-edited  Introduction to hierarchical tiling dynamical systems: Supertile construction methods Frank, Natalie Priebe (Auteur de la Conférence) | CIRM (Editeur )

These lectures introduce the dynamical systems approach to tilings of Euclidean space, especially quasicrystalline tilings that have been constructed using a ‘supertile method’. Because tiling dynamics parallels one-dimensional symbolic dynamics, we discuss this case as well, highlighting the differences and similarities in the methods of study and the results that can be obtained.
In the first lecture we motivate the field with the discovery of quasicrystals, which led to D. Schectman’s winning the 2011 Nobel Prize in Chemistry. Then we set up the basics of tiling dynamics, describing tiling spaces, a tiling metric, and the shift or translation actions. Shift-invariant and ergodic measures are discussed, along with fundamental topological and dynamical properties.
The second lecture brings in the supertile construction methods, including symbolic substitutions, self-similar tilings, $S$-adic systems, and fusion rules. Numerous examples are given, most of which are not the “standard” examples, and we identify many commonalities and differences between these interrelated methods of construction. Then we compare and contrast dynamical results for supertile systems, highlighting those key insights that can be adapted to all cases.
In the third lecture we investigate one of the many current tiling research areas: spectral theory. Schectman made his Nobel-prize-winning discovery using diffraction analysis, and studying the mathematical version has been quite fruitful. Spectral theory of tiling dynamical systems is also of broad interest. We describe how these types of spectral analysis are carried out, give examples, and discuss what is known and unknown about the relationship between dynamical and diffraction analysis. Special attention is paid to the “point spectrum”, which is related to eigenfunctions and also to the bright spots that appear on diffraction images.
These lectures introduce the dynamical systems approach to tilings of Euclidean space, especially quasicrystalline tilings that have been constructed using a ‘supertile method’. Because tiling dynamics parallels one-dimensional symbolic dynamics, we discuss this case as well, highlighting the differences and similarities in the methods of study and the results that can be obtained.
In the first lecture we motivate the field with the discovery of ...

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## Post-edited  Interview at CIRM: Konstantin Khanin Khanin, Konstantin (Personne interviewée) | CIRM (Editeur )

Konstantin "Kostya" Mikhailovich Khanin is a Russian mathematician and physicist. Khanin received his PhD from the Landau Institute of Theoretical Physics in Moscow and continued working there as a research associate until 1994. Afterwards, he taught at Princeton University, at the Isaac Newton Institute in Cambridge, and at Heriot-Watt University before joining the faculty at the University of Toronto. Khanin was an invited speaker at the European Congress of Mathematics in Barcelona in 2000. He was a 2013 Simons Foundation Fellow. He held the Jean-Morlet Chair at the Centre International de Rencontres Mathématiques in 2017, and he is an Invited Speaker at the International Congress of Mathematicians in 2018 in Rio de Janeiro.
CIRM - Chaire Jean-Morlet 2017 - Aix-Marseille Université
Konstantin "Kostya" Mikhailovich Khanin is a Russian mathematician and physicist. Khanin received his PhD from the Landau Institute of Theoretical Physics in Moscow and continued working there as a research associate until 1994. Afterwards, he taught at Princeton University, at the Isaac Newton Institute in Cambridge, and at Heriot-Watt University before joining the faculty at the University of Toronto. Khanin was an invited speaker at the ...

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## Post-edited  Weak universality of the KPZ equation with arbitrary nonlinearities Hairer, Martin (Auteur de la Conférence) | CIRM (Editeur )

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## Post-edited  Interview at CIRM: Martin Hairer Hairer, Martin (Personne interviewée) | CIRM (Editeur )

Martin Hairer KBE FRS (born 14 November 1975 in Geneva, Switzerland) is an Austrian mathematician working in the field of stochastic analysis, in particular stochastic partial differential equations. As of 2017 he is Regius Professor of Mathematics at the University of Warwick, having previously held a position at the Courant Institute of New York University. He was awarded the Fields Medal in 2014, one of the highest honours a mathematician can achieve.
Martin Hairer KBE FRS (born 14 November 1975 in Geneva, Switzerland) is an Austrian mathematician working in the field of stochastic analysis, in particular stochastic partial differential equations. As of 2017 he is Regius Professor of Mathematics at the University of Warwick, having previously held a position at the Courant Institute of New York University. He was awarded the Fields Medal in 2014, one of the highest honours a mathematician can ...

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## Post-edited  Variational formulas, Busemann functions, and fluctuation exponents for the corner growth model with exponential weights - Lecture 1 Seppäläinen, Timo (Auteur de la Conférence) | CIRM (Editeur )

Variational formulas for limit shapes of directed last-passage percolation models. Connections of minimizing cocycles of the variational formulas to geodesics, Busemann functions, and stationary percolation.

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## Post-edited  Integral points on Markoff type cubic surfaces and dynamics Sarnak, Peter (Auteur de la Conférence) | CIRM (Editeur )

Cubic surfaces in affine three space tend to have few integral points .However certain cubics such as $x^3 + y^3 + z^3 = m$, may have many such points but very little is known. We discuss these questions for Markoff type surfaces: $x^2 +y^2 +z^2 -x\cdot y\cdot z = m$ for which a (nonlinear) descent allows for a study. Specifically that of a Hasse Principle and strong approximation, together with "class numbers" and their averages for the corresponding nonlinear group of morphims of affine three space.
Cubic surfaces in affine three space tend to have few integral points .However certain cubics such as $x^3 + y^3 + z^3 = m$, may have many such points but very little is known. We discuss these questions for Markoff type surfaces: $x^2 +y^2 +z^2 -x\cdot y\cdot z = m$ for which a (nonlinear) descent allows for a study. Specifically that of a Hasse Principle and strong approximation, together with "class numbers" and their averages for the ...

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## Post-edited  Interview at CIRM: Mariusz Lemanczyk Lemanczyk, Marius (Personne interviewée) | CIRM (Editeur )

Jean-Morlet Chair 2016 Semester 2 - CIRM Luminy.
Mariusz Lemanczyk (Nicolaus Copernicus University,Torun) and Sébastien Ferenczi (I2M - Aix-Marseille Université).
Semester on 'Ergodic Theory and Dynamical Systems in their Interactions with Arithmetic and Combinatorics'.
CIRM - Chaire Jean-Morlet 2016 - Aix-Marseille Université

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## Post-edited  Interview at CIRM: Dipendra Prasad Prasad, Dipendra (Personne interviewée) | CIRM (Editeur )

Jean-Morlet Chair 2016: Cirm is delighted to welcome Dipendra Prasad (Tata Institute of Fundamental Research in Mumbai) and Volker Heiermann (I2M Marseille) for six months.
Five scientific events are scheduled at CIRM between January and June 2016 and a range of worldwide guests will be invited over this period.
CIRM - Chaire Jean-Morlet 2016 - Aix-Marseille Université

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## Post-edited  Beyond Endoscopy and elliptic terms in the trace formula Arthur, James Greig (Auteur de la Conférence) | CIRM (Editeur )

Beyond endoscopy is the strategy put forward by Langlands for applying the trace formula to the general principle of functoriality. Subsequent papers by Langlands (one in collaboration with Frenkel and Ngo), together with more recent papers by Altug, have refined the strategy. They all emphasize the importance of understanding the elliptic terms on the geometric side of the trace formula. We shall discuss the general strategy, and how it pertains to these terms.
Beyond endoscopy is the strategy put forward by Langlands for applying the trace formula to the general principle of functoriality. Subsequent papers by Langlands (one in collaboration with Frenkel and Ngo), together with more recent papers by Altug, have refined the strategy. They all emphasize the importance of understanding the elliptic terms on the geometric side of the trace formula. We shall discuss the general strategy, and how it ...

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## Post-edited  The local Langlands correspondence: functoriality, $L$-functions, gamma functions and the epsilon factors Prasad, Dipendra (Auteur de la Conférence) | CIRM (Editeur )

Spherical Hecke algebra, Satake transform, and an introduction to local Langlands correspondence.
CIRM - Chaire Jean-Morlet 2016 - Aix-Marseille Université

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## Post-edited  Interview at CIRM: François Lalonde Lalonde, François (Personne interviewée) | CIRM (Editeur )

François Lalonde, Professor at the Mathematics and Statistics Department of the Université de Montréal, was named Director of the Centre de recherches mathématiques (CRM) on September 14, 2004. The CRM is the first institute of research in mathematical sciences founded in Canada in 1969.
A member of the Royal Society of Canada since 1997, François Lalonde's research is mainly in the field of Symplectic geometry and topology. From 1996 to 2000, he directed the Institut des sciences mathématiques (ISM), a consortium of six Québec universities (Montréal, McGill, UQAM, Concordia, Laval and Sherbrooke). In this capacity, he developed the Institute by putting in place measures furthering the place of Montréal, and Québec as a whole, as a North American centre of excellence in mathematical research and training.
Mr. Lalonde was also the Founder and Director of the Centre interuniversitaire de recherche en géométrie différentielle et en topologie (CIRGET) which gathers together the best geometers and topologists from UQAM, McGill, Montreal and Concordia universities.
A mathematician and physicist by training, François Lalonde holds a Doctorat d’Etat (1985) from Orsay Center in Paris, in the field of differential topology. He was a Killam Research Fellowship recipient in 2000-2002 and holds a Canada Research Chair in the field of Symplectic Geometry and Topology. He is member of the editorial committees of the Canadian Journal of Mathematics and of the Canadian Bulletin of Mathematics. Member of the scientific committee of the First Canada-France congress in 2004 and plenary speaker at the First Canada-China congress in 1999, his works in collaboration with Dusa McDuff were presented in her plenary address at the ICM in 1998. He is an invited speaker at the ICM 2006.
CIRM - Chaire Jean-Morlet 2015 - Aix-Marseille Université
François Lalonde, Professor at the Mathematics and Statistics Department of the Université de Montréal, was named Director of the Centre de recherches mathématiques (CRM) on September 14, 2004. The CRM is the first institute of research in mathematical sciences founded in Canada in 1969.
A member of the Royal Society of Canada since 1997, François Lalonde's research is mainly in the field of Symplectic geometry and topology. From 1996 to 2000, ...

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## Post-edited  Persistence modules and Hamiltonian diffeomorphisms - Part 1 Polterovich, Leonid (Auteur de la Conférence) | CIRM (Editeur )

Theory of persistence modules is a rapidly developing field lying on the borderline between algebra, geometry and topology. It provides a very useful viewpoint at Morse theory, and at the same time is one of the cornerstones of topological data analysis. In the course I'll review foundations of this theory and focus on its applications to symplectic topology. In parts, the course is based on a recent work with Egor Shelukhin arXiv:1412.8277

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## Post-edited  Interview at CIRM: Herwig Hauser Hauser, Herwig (Personne interviewée) | CIRM (Editeur )

Herwig Hauser (Chair) and Guillaume Rond (Local Project Leader) held a Jean Morlet semester at CIRM from mid January to mid July 2015. Their scientific programme focused on 'Artin Approximation and Singularity Theory'. Artin Approximation concerns the solvability of algebraic equations in spaces of formal, convergent or algebraic power series. The classical version asserts that if a formal solution exists, then there also exists a convergent, hence analytic, and even algebraic solution which approximates the formal solution up to any given degree. As such, the theorem is instrumental for numerous constructions in algebraic geometry, commutative algebra and recursion theory in combinatorics. A series is Nash or algebraic if it is algebraic over the polynomials. Nash series can be codified by polynomial data deduced from the minimal polynomial by the normalization of the respective algebraic hypersurface. This makes them computable. The field has seen renewed activity through the recent research on Arc Spaces, Motivic Integration and Infinite Dimensional Geometry. Important questions remain still unanswered (nested subring case, composition problems, structure theorems for the solution sets) and were investigated during the program. Fruitful interchanges with the singularity theory, the combinatorics and the algebraic geometry groups took place. The scientific program was complemented by an exhibition of algebraic surfaces in the city of Marseille, based on the very successful "Imaginary" program designed by Hauser for the Mathematisches Forschungsinstitut Oberwolfach.
CIRM - Chaire Jean-Morlet 2015 - Aix-Marseille Université
Herwig Hauser (Chair) and Guillaume Rond (Local Project Leader) held a Jean Morlet semester at CIRM from mid January to mid July 2015. Their scientific programme focused on 'Artin Approximation and Singularity Theory'. Artin Approximation concerns the solvability of algebraic equations in spaces of formal, convergent or algebraic power series. The classical version asserts that if a formal solution exists, then there also exists a convergent, ...

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